package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * ClassName: DishServiceImpl
 * Package: com.sky.service.impl
 * Description:
 *
 * @Author BuTang
 * @Create 2023/10/25 13:08
 * @Version 1.0
 */
@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加菜品和口味
     * @param dishDTO
     *  @Transactional(rollbackFor = Exception.class)当发生任意故障的时候都会回滚
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        dishMapper.insert(dish);

        Long dishId = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() != 0 ){
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<DishVO> dishVOS = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(dishVOS.getTotal(),dishVOS.getResult() );
    }

    /**
     * 删除菜品
     * @param ids 菜品id
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteBatch(List<Long> ids) {
        for (Long id : ids){
            Dish dish = dishMapper.getById(id);

            //查看是否在起售状态，如果是在起售状态，那么就不允许删除
            if (dish.getStatus().equals(StatusConstant.ENABLE) ){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
                //判断菜品是否被套餐关联
                List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishId(ids);
                if (setmealIds != null && setmealIds.size() != 0){
                    throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
                }
                //当前菜品既没有被关联，且在停售状态

                dishFlavorMapper.deleteByDishId(ids);

                dishMapper.deleteByIds(ids);



    }

    /**
     * 获取菜品及口味信息
     * @param id 菜品
     * @return 菜品及口味信息
     */
    @Override
    public DishVO getByWithFlavor(Long id) {
        Dish dish = dishMapper.getById(id);
        List<DishFlavor> dishFlavor = dishFlavorMapper.getByDishId(id);

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavor);

        return dishVO;
    }

    @Override
    public void updateWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);
        Long id = dishDTO.getId();

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(Collections.singletonList(id));

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }  //修改菜品表基本信息


    }

    @Transactional(rollbackFor = Exception.class)
    @Override
    public void startOrStop(Long id, Integer status) {

        //修改菜品的状态
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.startOrStop(dish);

        //根据菜品id在setmeal_dish中查找对性的setmeal_id
        List<Long> ids = Collections.singletonList(id);
        if (status.equals(StatusConstant.DISABLE) ){
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishId(ids);

            if (setmealIds != null && setmealIds.size() != 0){
                for (Long setmealId : setmealIds){
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }

        }
    }


    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
